tree 4c6af9da2f1b01525014c8680f4d3c8955b54e12
parent 3ee175d9d9f9be0e345f7237ee921e58f68afdd7
author Peter Hurley <peter@hurleysoftware.com> 1415207565 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1415240650 -0800

tty: Invert tty_lock/ldisc_sem lock order

Dropping the tty lock to acquire the tty->ldisc_sem allows several
race conditions (such as hangup while changing the ldisc) which requires
extra states and testing. The ldisc_sem->tty_lock lock order has
not been required since tty buffer ownership was moved to tty_port.

Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>